update change log

docs/change-log.md

@@ -20,6 +20,7 @@
 -	fixed incorrect diff when document is root, and html element is omitted
 -	fixed querystring clobbering in links w/ config:m.route [#261](https://github.com/lhorie/mithril.js/issues/261)
 -	fixed rare bug that made events get dropped [#214](https://github.com/lhorie/mithril.js/issues/214)
+-	don't send Content-Type header if there's no request data [#280](https://github.com/lhorie/mithril.js/issues/280)
 
 ---
 

tests/mithril-tests.js

@@ -1553,11 +1553,18 @@ function testMithril(mock) {
 	})
 	test(function() {
 		var error = m.prop("no error")
-		var prop = m.request({method: "POST", url: "test"}).then(null, error)
+		var prop = m.request({method: "POST", url: "test", data: {foo: 1}}).then(null, error)
 		var xhr = mock.XMLHttpRequest.$instances.pop()
 		xhr.onreadystatechange()
 		return xhr.$headers["Content-Type"] == "application/json; charset=utf-8"
 	})
+	test(function() {
+		var error = m.prop("no error")
+		var prop = m.request({method: "POST", url: "test"}).then(null, error)
+		var xhr = mock.XMLHttpRequest.$instances.pop()
+		xhr.onreadystatechange()
+		return xhr.$headers["Content-Type"] === undefined
+	})
 
 	// m.request over jsonp
 	test(function(){